(19)

(11)

EP 1 413 157 A1

(12)

(43) Date of publication: 28.04.2004 Bulletin 2004/18 (21) Application number: 02745025.3 (22) Date of filing: 16.07.2002

(51) International Patent Classification (IPC)7: H04Q 7/32, H04L 29/06, H04L 9/32 (86) International application number: PCT/CA2002/001079 (87) International publication number: WO 2003/009619 (30.01.2003 Gazette 2003/05)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR Designated Extension States: AL LT LV MK RO SI (30) Priority: 16.07.2001 US 905113 (71) Applicant: Certicom Corp. Mississauga,Ontario L4W 5L1 (CA)	(72) Inventor: VANSTONE, Scott, A. Campbellville, Ontario L0P 1B0 (CA) (74) Representative: Barnfather, Karl Jon, Dr. et al Withers & Rogers,Goldings House,2 Hays Lane London SE1 2HW London SE1 2HW (GB)